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The Efficacy of Capsaicin Sensitivity Testing in Patients With Irritable Larynx Syndrome

NCT02065128 · Status: WITHDRAWN · Type: OBSERVATIONAL

Last updated 2017-08-01

No results posted yet for this study

Summary

Irritable larynx syndrome (ILS) is a hyperkinetic laryngeal dysfunction that is characterized by a persistent cough, voice changes, or breathing difficulties, which are often triggered by an irritant. Diagnosis of ILS is difficult and typically made via a thorough review of the clinical history and, occasionally, the patient's reaction to an odor-provocation test. Standard treatment for ILS is behavioural therapy with a speech language pathologist (SLP), which provides symptom improvement for most patients. However, currently, there are no objective measures of the upper airway hyper-responsiveness in this condition to assist in diagnosing and monitoring disease severity.

Since the cough is irritant-based, it is anticipated that patients with ILS will have a hypersensitivity to the irritant capsaicin. Capsaicin is the active component of chili peppers and is what makes them hot. The capsaicin cough challenge is a well recognized test that involves inhaling different concentrations of capsaicin solutions to determine a cough reflex sensitivity.

The purpose of this research study is to confirm that ILS patients have a hypersensitivity to capsaicin compared to healthy volunteers. If a hypersensitivity is observed in ILS patients, the second objective of this study will be to see if behavioural therapy improves the cough reflex sensitivity in this patient population.

Conditions

Interventions

OTHER

Capsaicin cough challenge test

The capsaicin cough challenge testing will be conducted in the pulmonary function laboratory at SMH by a pulmonary function technologist. The test involves having the participant inhale increasing concentrations of capsaicin solutions and assessing their response. The tidal breathing method and solution preparation presented by Nejla, et al. 12 will be used to conduct this testing. The tidal breathing method is preferred to the alternative dosimeter method as it produces similar results with lower capsaicin concentrations thereby resulting in less throat irritation for the participant. The technique is detailed in the following sections.

Sponsors & Collaborators

  • Unity Health Toronto

    lead OTHER

Principal Investigators

  • Jennifer Anderson, MD, FRCS(C) · Chief, Department of Otolaryngology - Head and Neck Surgery

Eligibility

Min Age
18 Years
Sex
ALL
Healthy Volunteers
Yes

Timeline & Regulatory

Start
2017-08-01
Primary Completion
2017-08-31
Completion
2017-08-31

Countries

  • Canada

Study Locations

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Entities

Diseases

Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT02065128 on ClinicalTrials.gov